Analysis of Main Effect of Independent Six-individual Characteristic Factors and Workplace Temperature on Safe Weight of Lift Model

Abstract

This study analysed main effect of the independent six-individual characteristic gender based factors of age, body weight, spinal shrinkage, spine length, and frequency of lifts, and workplace temperature on safe weight of lift model. These six-individual characteristic factors and workplace temperature selected were based on biomechanical, physiological and psychophysical approaches. These were yet to be seen used together in any other studies. The human ergonomic factors and workplace temperature were compounded to develop a safe weight of lift (SWL) model using principle of strain energy to determine safe weight that can minimise threat of developing low back pain among manual workers. A subjective selection technique was used to select 50 practising male construction workers. The measurements of human ergonomic factors and workplace temperature were obtained using the ZT-160 scale, stadiometer, measuring tape, clock timer and Extech RH/Temperature pen device. The obtained data were inputted into the SPSS to analysis main effect of human ergonomic factors and workplace temperature on SWL model. Data were analysed using Multiple Linear Regression (MLR) and ANOVA at . The main effect analysis of the six-individual characteristic factors gave highest R² and ? of 0.33 and 0.58 for the spinal shrinkage. The body weight and spinal shrinkage were statistically significant at p<.05. The ANOVA analysis results revealed that only body weight was significant at p<.05 with highest F-test = 3.47. Hence, the analyses of the human ergonomic factors and workplace temperature independently shown that body weight is the most significant factor of the developed model.